Sustainable Hybrid Design to Ensure Efficiency and Air Quality of Solar Air Conditioning

Abstract

This research work aims to investigate and subsequently optimize the operating parameters that affect thermal comfort and indoor air quality in the school environment. The proposed design uses a coupling between solar ventilation and the absorption chiller-air conditioning. The heating tower of an adsorption chiller connected to an air conditioning system can be driven by the waste heat from a solar ventilation (exhausted hot air) system thank to this linkage. In order to simulate variables like the velocity magnitude distribution in the air-conditioned room, mathematical modeling is numerically executed. Air temperature evolution along the height of the conditioned room in the mid-length and the air velocity evolution along the length of the conditioned room in the mid-height are studied. According to the numerical simulation results, the inlet air temperature soars as the inlet air velocity rises. Inlet air velocities of 0.05m/s, 0.5m/s, and 1m/s are correlated with inlet air temperatures of 20.7°C, 21.2°C, and 21.3°C, respectively. We conclude that an inlet air velocity in the order of 1m/s (in relation to a maximized air change rate) is in agreement with the general ASHRAE standards for indoor air quality in the case of the school environment, coupled with the essential need to limit as much as possible the spread of viruses.

Atmospheric CO2 Level Measurement and Discomfort Index Calculation with the use of Low-Cost Drones

“…Measurements of CO 2 were recorded for 60 min for each sensor. The calibration step was repeated in a monthly basis to assure a relation coefficient as near as possible to 1 [3].…”

“…The rise of Green House Gas (GHG) emissions globally (Figure 1) is caused by fossil fuel burning and, consequently, the increase in CO 2 levels worldwide. The concentrations of CO 2 emissions were highest in the year 2018, and after the COVID-19 pandemic, the level has not reduced significantly [3]. The major reason behind these elevated levels of GHGs is the utilization of fossil fuels in non-organized sectors.…”